public void GetLimitString()
        {
            FirebirdDialect d = new FirebirdDialect();

            SqlString str = d.GetLimitString(new SqlString("SELECT * FROM fish"), null, new SqlString("10"));

            Assert.AreEqual("SELECT first 10 * FROM fish", str.ToString());

            str = d.GetLimitString(new SqlString("SELECT * FROM fish ORDER BY name"), new SqlString("5"), new SqlString("15"));
            Assert.AreEqual("SELECT first 15 skip 5 * FROM fish ORDER BY name", str.ToString());

            str = d.GetLimitString(new SqlString("SELECT * FROM fish ORDER BY name DESC"), new SqlString("7"), new SqlString("28"));
            Assert.AreEqual("SELECT first 28 skip 7 * FROM fish ORDER BY name DESC", str.ToString());

            str = d.GetLimitString(new SqlString("SELECT DISTINCT fish.family FROM fish ORDER BY name DESC"), null, new SqlString("28"));
            Assert.AreEqual("SELECT first 28 DISTINCT fish.family FROM fish ORDER BY name DESC", str.ToString());

            str = d.GetLimitString(new SqlString("SELECT DISTINCT fish.family FROM fish ORDER BY name DESC"), new SqlString("7"), new SqlString("28"));
            Assert.AreEqual("SELECT first 28 skip 7 DISTINCT fish.family FROM fish ORDER BY name DESC", str.ToString());
        }